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Rainfall and Bird Beaks

※ Download: Rainfall and bird beaks gizmo answer key

Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. On the right side, sketch what you think the chart will look like after five years of drought.

The bars represent the numbers of finches that have different beak depths. Based on the table, which part of the year do you think is the rainy season? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches?

Rainfall and Bird Beaks - It change by each amount of rain fall by finch. The beak depth of a finch is the distance from the top of the beak to the bottom, as shown.

The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depth? Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? Does the beak depth change significantly? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? The finches have their young during the rainy season. Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? Predict: Select the BAR CHART tab. On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Initial beak depths Beak depths after 5 years predicted Initial number of finches: Explanation: Initial average depth: Initial range of beak depths: 3. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range. Stabilizing selection occurs when intermediate individuals are the most likely to survive. Is directional selection, stabilizing selection, or both operating in this example? Think and discuss: Evolution is the process by which populations of organisms can change over time. How is directional selection related to evolution? The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depth? Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? Does the beak depth change significantly? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. RAINFALL AND BIRD BEAK 1. THE BEAK DEPTH OF A FINCH FROM THE TOP OF THE BEAK TO BOTTOM,AS SHOWN. WHAT IS THE CURRENT AVERAGE BEAK TO THE GIZMO? SELECT THE BAR CHART BAR. DO ALL THE FINCHE HAVE THE SAME DEPTH? CLICK PLAY AND LET THE SIMULATION PLAY FOR 5 YEAR WITH AVERAGE RAINFALL 5 INCHES. HOW DOES THE FINCH POPLATION CHANGE? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? The finches have their young during the rainy season. Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? Predict: Select the BAR CHART tab. On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Initial beak depths Beak depths after 5 years predicted Initial number of finches: Explanation: Initial average depth: Initial range of beak depths: 3. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range. Stabilizing selection occurs when intermediate individuals are the most likely to survive. Is directional selection, stabilizing selection, or both operating in this example? Think and discuss: Evolution is the process by which populations of organisms can change over time. The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depth? Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? Does the beak depth change significantly? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? It decreases with a large amount of rainfall 1. Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? It Decreased The finches have their young during the rainy season. Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? No because most of the bugs have been washed away so thier food supply has been decreased. The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? Predict: Select the BAR CHART tab. On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Initial beak depths Beak depths after 5 years predicted Initial number of finches: Explanation: Initial average depth: Initial range of beak depths: 3. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range. Stabilizing selection occurs when intermediate individuals are the most likely to survive. Is directional selection, stabilizing selection, or both operating in this example? Think and discuss: Evolution is the process by which populations of organisms can change over time. How is directional selection related to evolution? The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depth? No they do not 2. Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? Does the beak depth change significantly? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? The beaks gets smaller 1. Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? Some increase and some decrease The finches have their young during the rainy season. Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? Predict: Select the BAR CHART tab. On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Initial beak depths Beak depths after 5 years predicted Initial number of finches: Explanation: Initial average depth: Initial range of beak depths: 3. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range. Stabilizing selection occurs when intermediate individuals are the most likely to survive. Is directional selection, stabilizing selection, or both operating in this example? Think and discuss: Evolution is the process by which populations of organisms can change over time. How is directional selection related to evolution? The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depth? Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? Does the beak depth change significantly? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? The finches have their young during the rainy season. Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? Predict: Select the BAR CHART tab. On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Initial beak depths Beak depths after 5 years predicted Initial number of finches: Explanation: Initial average depth: Initial range of beak depths: 3. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range. Stabilizing selection occurs when intermediate individuals are the most likely to survive. Is directional selection, stabilizing selection, or both operating in this example? Think and discuss: Evolution is the process by which populations of organisms can change over time. How is directional selection related to evolution? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? The finches have their young during the rainy season. Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Think and discuss: Evolution is the process by which populations of organisms can change over time. How is directional selection related to evolution? The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depht? Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? Does the beak depth change significantly? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? The finches have their young during the rainy season. Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? Predict: Select the BAR CHART tab. On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Initial beak depths Beak depths after 5 years predicted Initial number of finches: Explanation: Initial average depth: Initial range of beak depths: 3. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range. Stabilizing selection occurs when intermediate individuals are the most likely to survive. Is directional selection, stabilizing selection, or both operating in this example? Think and discuss: Evolution is the process by which populations of organisms can change over time. How is directional selection related to evolution? The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depth? Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? Does the beak depth change significantly? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? Predict: Select the BAR CHART tab. On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Initial beak depths Beak depths after 5 years predicted Initial number of finches: Explanation: Initial average depth: Initial range of beak depths: 3. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range. Stabilizing selection occurs when intermediate individuals are the most likely to survive. Is directional selection, stabilizing selection, or both operating in this example? Think and discuss: Evolution is the process by which populations of organisms can change over time. How is directional selection related to evolution? The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depth? Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? It increases and decreases constantly. Does the beak depth change significantly? Because it moves up and down a little bit. Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? It increases and decreases constantly. Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? The finches have their young during the rainy season. Based on the table, which part of the year do you think is the rainy season? During the 4th year and 3rd month. Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? Predict: Select the BAR CHART tab. On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Initial beak depths Beak depths after 5 years predicted Initial number of finches: Explanation: Initial average depth: Initial range of beak depths: 3. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range. Stabilizing selection occurs when intermediate individuals are the most likely to survive. Is directional selection, stabilizing selection, or both operating in this example? Think and discuss: Evolution is the process by which populations of organisms can change over time. How is directional selection related to evolution? The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depth? Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? Does the beak depth change significantly? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Initial beak depths Beak depths after 5 years predicted Initial number of finches: Explanation: Initial average depth: Initial range of beak depths: 3. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range. Stabilizing selection occurs when intermediate individuals are the most likely to survive. Is directional selection, stabilizing selection, or both operating in this example? Think and discuss: Evolution is the process by which populations of organisms can change over time. How is directional selection related to evolution? The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depth? Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? Does the beak depth change significantly? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? Predict: Select the BAR CHART tab. On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Initial beak depths Beak depths after 5 years predicted Initial number of finches: Explanation: Initial average depth: Initial range of beak depths: 3. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range. Stabilizing selection occurs when intermediate individuals are the most likely to survive. Is directional selection, stabilizing selection, or both operating in this example? Think and discuss: Evolution is the process by which populations of organisms can change over time. How is directional selection related to evolution? The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depth? No They Dont 2. Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? Does the beak depth change significantly? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? It Changes By Each Amount Of Rainfall By Inches 1. Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? It Went Up Than It Droped Alot! The finches have their young during the rainy season. Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. What is the current average beak depth in the Gizmo? Select the BAR CHART tab. Do all the finches have the same beak depth? Select the GRAPH tab and view the Finches vs time and Beak depth vs time graphs. How does the finch population change? Does the beak depth change significantly? Introduction: The Galápagos Islands are very dry, with an average rainfall on some islands of only five inches per year. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Question: How is the finch population affected by a period of average rainfall? Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. Select the TABLE tab and look at the Month and Finches columns. How did the finch population change over the course of one year? Based on the table, which part of the year do you think is the rainy season? Analyze: Click Reset, and choose the BAR CHART. The bars represent the numbers of finches that have different beak depths. The range of beak depths is equal to the difference between the largest and smallest beaks. What is the average beak depth of the current finch population? What is the range in beak depths in the population? Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range? Experiment: Click Play, and observe the bar chart as the simulation plays for five years. What is the average beak depth now? What is the current range of beak depths? Based on what you have seen, are finches with very small, medium, or very large beaks most likely to survive in times of normal rainfall? The small, delicate seeds get eaten up quickly, leaving behind only the largest, toughest seeds. Question: How does drought affect the finch population and average beak depth? Form hypothesis: What type of beak do you think will be best for finding food in a drought? On the left side below, sketch the current bar chart and list the average beak depth and range of beak depths. On the right side, sketch what you think the chart will look like after five years of drought. Explain your predicted graph. Initial beak depths Beak depths after 5 years predicted Initial number of finches:answer 10. Experiment: Use the sliders to set the Rain to one inch for each of the five years in the simulation. Click Play, and wait for five years. Observe the beak of the finch. How does the beak depth change over time? What is the final average beak depth? What is the final range of beak depths? Describe: Compare the final bar chart to the initial bar chart. How have the finches been affected by drought? Describe at least two changes that you notice. Analyze: Was the increase in the average beak depth caused by an increase in largebeaked finches or a decline in small-beaked finches? Draw conclusions: What do you think caused the changes in the finch population and average beak size during the drought? Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range. Stabilizing selection occurs when intermediate individuals are the most likely to survive. Is directional selection, stabilizing selection, or both operating in this example? Think and discuss: Evolution is the process by which populations of organismes os can change over time. How is directional selection answer it changes overtime Rainfall and bird beak Question; How is the finch population affected by a peroid of average rainfall? It change by each amount of rainfall has a large impact on the abondance and type of seed that are auailable only the finche that are best adapted to the available seed type survive and have offspring. Question;How is the finch population affected by a peroid of average rainfall? It change by each amount of rain fall by finch. Select the table tab and look at the mouth and finches colums. How did the finch population change over the course of 1 yr? It went up than it drop alot.

The range of beak depths is equal to the difference between rainfall and bird beaks gizmo answer key largest and smallest beaks. The beak depth of a finch is the distance from the top of the beak to the bottom, as shown. The range of beak depths is equal to the difference between the largest and smallest beaks. Explain your predicted graph. Form hypothesis: What type of beak do you think will be best for finding food in a drought. In the process of natural selection, only the finches that are best adapted to the available seed types survive and have offspring. Observe: With the Rain sliders set to 5 inches, click Play, and then Pause after one year has passed. The amount of rainfall has a large impact on the abundance and types of seeds that are available to be eaten by finches. Question: How is the finch population affected by a period of average rainfall. Does the beak depth change significantly. What is the average beak depth of the current finch population. Interpret: Directional selection occurs when individuals at one end of a range are more likely to survive than intermediate individuals or individuals at the opposite end of the range.